# Grey Matter Training vs Coach Kostas Corner

Grey Matter Training and Coach Kostas Corner are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Grey Matter Training sells 1 in-app purchase, starting at $399.99 per month and Coach Kostas Corner sells 1 in-app purchase, starting at $200.00 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Grey Matter Training against 5.0 for Coach Kostas Corner. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

Grey Matter Training ships an update monthly, Coach Kostas Corner every 2 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Grey Matter Training | Coach Kostas Corner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/grey-matter-training/id6444868629/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/coach-kostas-corner/id6483931817/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 47 MB | 51 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Michael White](https://appshunter.io/developer/1657473344) | [Konstantinos Kopsinis](https://appshunter.io/developer/1740364170) |

## What reviewers say

### Grey Matter Training

[App page](https://appshunter.io/ios/app/grey-matter-training/id6444868629)

This app offers personalized, science-backed training, nutrition, and supplement guidance for competitive athletes and fitness enthusiasts. It requires a paid coaching plan to access its full features.

**Highlights:** Individualized training plans, Evidence-based nutrition guidance, Supplementation strategies, For physique and strength athletes, For training enthusiasts

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Coaching | $399.99 | per month |


### Coach Kostas Corner

[App page](https://appshunter.io/ios/app/coach-kostas-corner/id6483931817)

Access a comprehensive coaching and transformation mentorship designed for goal achievement. Receive personalized workout and nutrition plans, mindset development tools, and progress tracking to support your journey to a healthier and more successful life.

**Highlights:** Personalized coaching programs, Customized workout plans with videos, Bespoke nutrition plans with food logging, Mindset and self-development blueprints, Progress tracking and data logging, Messaging and reminders

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Coaching | $200.00 | per month |


## Frequently asked questions

### Is Grey Matter Training free?

Grey Matter Training is free to download, with in-app purchases available.

### Is Coach Kostas Corner free?

Coach Kostas Corner is free to download, with in-app purchases available.

### Which has better reviews, Grey Matter Training or Coach Kostas Corner?

Grey Matter Training and Coach Kostas Corner are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.

### Do Grey Matter Training or Coach Kostas Corner have ads?

Neither Grey Matter Training nor Coach Kostas Corner shows ads.

### Which is updated more often, Grey Matter Training or Coach Kostas Corner?

Grey Matter Training ships an update monthly, and Coach Kostas Corner every 2 months. Most recently, Grey Matter Training was updated on November 3, 2026 and Coach Kostas Corner on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*